Vienna, MD Water Safety: 95/100 (2026)
1 ZIP code · 1 water system · Updated 2026-06-03
Residents of Vienna generally live with tap water that beats the MD safety average on key EPA compliance metrics.
How Vienna Compares
Data: EPA SDWIS Last verified: 2026-06-03
Vienna Water: The Quick Version
- Average lead level: 0.0012 mg/L.
- Homes built before 1986: 70% — older plumbing may contain lead solder.
- Estimated remediation: $1,200 per household.
- CDC health risk index: 15.89 — above typical levels.
Water Systems Serving Vienna
One utility dominates residential water service in Vienna, MD — out of 1 system in federal records.
Overview
We track water quality and home safety data for 1 ZIP code in Vienna, Maryland, covering 1 community water system serving approximately 889 people.
No EPA violations recorded across any ZIP codes in Vienna — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Vienna: A (95/100)
The score combines three factors:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| Lead Levels | 90th percentile lead concentration vs EPA action level |
| Radon Risk | EPA radon zone classification |
Water Sources
Vienna water systems draw from: Groundwater.
Lead & Copper
- Average lead level (90th percentile): 0.0012 mg/L (EPA action level: 0.015 mg/L)
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 3 (Low Risk)
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 21869 | A | Town of Vienna | 460 |
All ZIP Codes in Vienna
- 21869 [A]
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
Updated daily.
CDC Health Data for Vienna
Source: CDC PLACES (County-level estimates). Water contamination can correlate with respiratory and chronic health conditions.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
How Old Is Vienna's Housing Stock?
With 70% of homes built before 1986, lead solder in plumbing is a potential concern. The EPA banned lead solder in 1986, but many older homes retain original plumbing.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
Federal plumbing rules changed in two stages — lead pipes were phased out before 1970, and lead solder was banned in 1986 — but in Vienna, where the median build year is 1950, most of the housing was already in place before those rules took effect. The materials installed under older standards remain embedded in a substantial portion of the residential inventory today.
Over half of homes in Vienna were built before 1986, when lead solder was banned. Older plumbing may leach lead into drinking water, especially with corrosive water chemistry.
Source: U.S. Census Bureau ACS B25034.
Vienna: Remediation Cost in Perspective
In Vienna, property values comfortably outpace what documented remediation typically costs — the equity share is proportionally low.
Remediation costs in Vienna are relatively low compared to home values. The $800–$1,800 estimated range is a small fraction of median property value. Home values are 53% below the Maryland average.
Protecting Children from Lead in Vienna
Why children are most at risk: The CDC states there is no safe level of lead exposure for children. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
Reading the local data together points toward a structural gap that matters more here than in low-exposure communities. 70% of Vienna stock comes from the pre-rule era, and citywide monitoring either approaches or sits beyond the federal benchmark under Lead and Copper Rule sampling. A baseline kit fits the routine-diligence category, with certified filtration available via retailer networks where confirmed faucet results warrant additional measures.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Climate-Related Water Risk for Vienna
Although Vienna's flood history doesn't reach high-severity thresholds, NFIP data documents 1 claim and FEMA maps place 100% of ZIP codes in designated flood zones — a combined profile that makes flood-related water quality considerations a reasonable planning baseline.
Vienna has a moderate flood history with 1 FEMA claims averaging $11,084 per payout. 100% of ZIP codes fall within FEMA flood zones. Flood events can contaminate drinking water and overwhelm treatment systems.
How flooding affects water quality: Flood events can introduce sewage, agricultural runoff, and industrial chemicals into water supplies. Even after floodwaters recede, contamination can persist in wells and aging infrastructure. Flood damage can add significantly to the estimated <strong>$1,200</strong> remediation cost per household.
Residents in flood-prone areas should consider flood insurance even outside FEMA zones — over 25% of flood claims come from low-to-moderate risk areas. After any flood event, test your water before drinking.
Source: FEMA National Flood Insurance Program (NFIP) claims data, FEMA flood zone designations.
Deep Dive Reports
Detailed analysis for Vienna, MD